-er -ey eee eef eeo eer eet eex eey ef- efe eff efo efr eft efx eo- eoe eof eoo eor eot ere erf ero err ert ery ete etf eto etr ett etx ety ex- exe exo exr ext exx exy eye eyo eyr eyt fee fef feo fer fet fex fey ffe fff ffo ffr fft ffx ffy foe fof foo for fot fox foy fre frf fro frr frt fry fte ftf fto ftr ftt ftx fty fxe fxr fxt fxx fy- fye fyo oee oef oeo oer oet oex oey of- ofe off ofo ofr oft ofx oo- oof ooo oor oot oox or- ore orf oro orr ort orx ory ot- ote otf oto otr ott ox- oxf oxo oxt oxx oxy oye oyo re- ree ref reo rer ret rex rey rfe rff rfo rfr rft roe rof roo ror rot rox roy rrf rrr rrt rte rtf rto rtr rtt rtx rty rxr ry- rye ryf ryo ryr ryy t-x te- tee tef teo ter tet tex tey tfe tff tfo tfr tft tfx to- toe tof too tor tot tox toy tre trf tro trr trt trx try tte ttf tto ttr ttt ttx tty txe txf txt tye tyf tyo tyr tyt xee xer xet xex xfe xft xfx xof xoo xor xot xox xrf xrt xrx xry xtf xtr xtx xty xxo xxx xxy xyr xyy yee yef yeo yer yet yex yey yfe yff yfr yft yoe yof yoo yor yot yox yoy yre yrf yro yrt yte ytf yto ytr ytt yxe yxy yye yyf yyt yyy